On Zix Email Threat Protection's Privacy Page you can request and collect all the privacy and GDPR related information that Zix Email Threat Protection is providing.
The privacy policy by is a legal document or statement that discloses how Zix Email Threat Protection gathers, uses, discloses, and manges their customers' data.
The basis for Zix sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.